Hugo p



H. P. NIESEN.

REFILLABLE CARTRIDGE FUSE.

APPLICATION FILED FEB. 4. 1918.

Putentcdept. IIS, MMSI.

lll.

HUG@ NIESEN, F BUFFAL, NEW

REFILLABLE CARTRIDGE-FUSE.

Specification of Letters Patent.

Patented Sept.. 16, 1919.

Application 'filed February s, i918. 'Serial No. 215,277.

` of New York, have invented new and useful Improvements in Refillable Cartridge- Fuses, of which the following is a speciiication.

This invention relates more particularly to fuses of the cartridge type which are. so constructed that the fuse-member or link can be renewed.

Qne of the objects of my invention is the production of an inexpensive fuse of this kind comprising few parts which can be.

readily assembled.

A. further vobject is to improve the construction of such fuses with a view of facilitating the refilling or renewal of the fuse-link.

In the accompanying drawings:

Figure l is a side elevation of a cartridgefuse having knife-blade termina-ls and embodying the invention. Fig. 2 is a longitudiv nal'section thereof. Fig. 3 is a fragmentary longitudinal section at right angles to Fig. 2. Fig. 4 is a cross-section on line 4 4, Figi. Fig. 5 is a similar section showing the position of one of the cap-ears `preparatory to turning the cap to its normal locked position. Fig. f6 is a side elevation of the original form of the fuse-link. Fig, 7 is a side elevation of a cartridge-fuse of the ferrule type embodying the invention.

Similar characters of reference indicate corresponding parts throughout 'the severa-l views.

Referring to Figs. 1 6, l indicates Ithe tubular body or shell of the fuse and 2 the metallic end-caps applied thereto and carrying the terminal contact-lugs or blades 3.

In the construction shown, these lugs pass.

through central slots 4 formed in the heads of the caps and are provided ywith internal ears or extensions 5. Each of these eXtensions has a screw-threaded transverse opening G which receives a fastening-screw 7 passing through a circular or other suitable opening in the shell. Each of these screws is provided within the shell and at a suitable distance from its inner end with a nut orv collar 8 adapted to clamp the adjacent end of the fuse-link 9 against the companion ear 5. The heads `of these screws are preferably nicked` to receive a screw driver, but they may be flat sided, if desired, to receive a wrench. rIhese collars also serve as stops to prevent complete withdrawal or loss of the screws when unscrewed from said ears.

rIhe fuse-link has holes 10 for the passage of the screws 7, and it is also preferably provided at its ends with retaining lips or extensions ll adapted to be bent around the collars of the screws, as shown in Fig. 2, to retain the link upon the screws in assembling the parts of the fuse.

In the preferred construction shown in the drawings, the end-caps 2 are provided with L-shaped slots or notches 12 which receive the screws 7. As shown in Fig. l, these slots extend inwardly from the inner edges of the caps, and the closed or outer ends of the transverse portions of the slots are arranged to register with the threaded holes of the respective ears 5 when the parts are properly assembled ande-secured together. By this construction, the screws perform the double function of securing the caps to the ends of the cartridge-body and the fuse-link to said ears. At the same time, the L-shaped slots by the above-described relation between their horizontal portions and the perforated ears, serve to predetermine the proper position of the ears to receive the screws and thus facilitate the assemblage of the parts.

In order to pass the caps over the ends of the shell, the longitudinal portions of their slots must be brought in line with the cla-Inping screws. In this position of the caps their ears stand obliquely to the screws and clear them, as sho-wn in Fig. 5, thereby permitting the ycaps to be fully slipped upon the shell. 'Io lock the caps in place, they are turned until the closed ends of their slots come in contact with the screws. By this partial rotary movement, the ears 5 are turned at right angles to the screws in which position their holes register with and easily receive the ends thereof, as shown in Fig. 4, the transverse portions of the slots being of such length that their closed ends form stops which predetermine the proper assembling position of these parts. Upon now tighten- Fig. G, is then engaged .with the inner ends ot the screws and 1ts lips ll are bent around said collars to hold 1t reliably thereon. The

caps are then passed over the ends of the shell and turned to their limit, as hereinloefore describe-d, to bring the ear-holes 6 in register with the screws, after which the screws are tightened to secure the link and the caps in position. The travel of the nuts or collars on the screws l' may be limited b y any suitable stop-means; :tor example, by flattening or mutilating the threads or screws at the proper point alter applying the nuts.

To renevv the fuse-link, the operations just described are `performed in the reverse order and a. new fuse is substituted for the blown one, after which the caps are replaced and the screws l tightened.

The invention is obviously applicable to oartridge-fuses of the terrule type, as well as the end-lug type. lfifr. 7 shows its embodiment in a fuse of the ferrule type, the only difference between the oonstruction shown in Fig. 7 and that-illustrated in the remaining figures being that the terminallugs 3 of the first-described construction are omitted.

This improved construction, while taeilitating the refilling of the cartridge, involves a minimum num '\er of parts and can theaore be manufactured at low cost,

Leiders l claim as my invention:

l. A cartridge-fuse comprising a shell, a terminal-member applied to the end of the shell and carrying an internal ear, aA fuselinl, a fastening member passing through the shell and the uselinlt and engaging said ear, said fastening member being provided within the shell with a projecting part and the end port-ion of the fuse-link interlocking with said projecting part, to retain the link on said fastening-member while applying said terminal member and ear to the shell.

2. A cartridge-fuse coniprising a shell, a terminal-member applied to Ithe end of the shell 'and lcarrying an internal ear, a screw passing through the shell and engaging said ear, said screw having a collar within the shell, land a fuse-link clamped to said ear by said screw and interlocking with said collar.

3. A cartridge-fuse comprising a shell7 a terminal-member applied to the end ot' the shell and carrying an internal ear7 a. screw passing through the shell and engaging said ear, said screw having a Collar Within the shell, and va fuse-link clamped between said ear and said collar and provided at its end with a lip which is bent around the collar to retain the link in place on the screw in assembling the parts.

HUG@ lli NESEN. 

